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Topic: Moles Calculations  (Read 9304 times)

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Offline ARGOS++

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Re: Moles Calculations
« Reply #15 on: March 20, 2009, 05:13:29 PM »
Dear book_luvr;

AGAIN:
The number is correct, but you forgot the units!
You have to work with units, otherwise you get lost!

Good Luck!
                    ARGOS++
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Offline book_luvr

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Re: Moles Calculations
« Reply #16 on: March 20, 2009, 06:04:55 PM »
^Ooooooops okay clearly im bad with units.. so the unit would be 44.08 mol (not sure if i am suposed to add the -1???, what does it mean???)
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Offline Las

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Re: Moles Calculations
« Reply #17 on: March 20, 2009, 06:09:17 PM »
the units are gmol-1....ie. grams per mol..(the number of grams in 1 mol of substance)
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Offline ARGOS++

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Re: Moles Calculations
« Reply #18 on: March 20, 2009, 06:14:08 PM »

Dear book_luvr;

Molar mass has the unit g/mole, so 44.08 g/mole would be correct!

Now you can divide your mass of propane by the molar mass, as you told before!
Units again!!

Good Luck!
                    ARGOS++
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Offline book_luvr

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Re: Moles Calculations
« Reply #19 on: March 22, 2009, 10:56:27 PM »
Okay how could I possibly answer

What is the mass of 0.750mol of lead (II) nitrate

Should I make the formula.... Pb2NO3 and then find the molar mass of that...then i have no idea what i'd do after that!
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Offline UG

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Re: Moles Calculations
« Reply #20 on: March 22, 2009, 11:00:15 PM »
mass(Pb(NO3)2) = amount of moles of Pb(NO3)2 x molar mass Pb(NO3)2

General formula: m=nM
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